And some more . . .
This part's a little odd, but since it's working pretty well, I'll share it. Your mileage may vary.
In the original plan, when it was time to dine, we moved the keyboard stand table up to the front and sat on the sofa. That was OK for eating, though a bit of a pain to get up from in the middle of the meal. And that setup didn't work at all if you wanted to play cards or do anything else that profits from a face-to-face orientation.
Since it was easy enough to keep two easy-to-move chairs around--one from the desk/table and one of the deployed Pico chairs, I ended up with this . . .
First, two slide-out table supports bought from Rockler got screwed to the bottom of the table top.
Then a piece of plywood was cut to the width of the part of the kitchen cabinet that holds the slide-out refrigerator. A couple of pieces of thick rubber were stuck in the right spots to locate the board and give it vertical support. And, though you can't see it in this photo, I drilled through the cabinet side into each end of the board, and bought a couple of small hitch pins to stick into the holes.
So the semi-goofy part is that I made the table top out of Gatorfoam bought from the local Blick art supply store. Gatorfoam is neither cheap or expensive, about $5 per square foot for 1/2 thick material, which is what I used. It's at an art supply place because it is usually used for mounting pictures and making signage. It's got a polystyrene core that's sandwiched between thin resin-impregnated surfaces, and as a result of these outer surfaces, the board is water-resistant and pretty strong. And it weighs just a couple of ounces per square foot. So I gave it a shot, cutting a piece that rested on the table supports and the support board, with a notch in the the drivers side edge to locate the board.
If you put one of the chairs forward of the board and one aft of it, you have a nice big face-to-face table, especially since the adjacent wood table top can also hold dinner stuff. The Gatorfoam surface is plenty strong to hold the plates, rest your elbows on it, etc.; I've no worries about it collapsing. And the way it's mounted locks the top in place front-to-back so it's really stable.
Gatorfoam comes in white or black. I bought white, and then decided black was better, so I painted it (for reasons I can't explain) with Rustoleum make-anything-into-a-chalkboard paint. That gave a nice matte finish (and someday I'll get some chalk and write something on it) but I'm sure any paint on the white Gatorfoam would work well.
The best thing about using the Gatorfoam instead of plywood or some similar material is that the table top doesn't even weigh a pound. When it's not in use, it's trivial to store it at the rear of the kitchen cabinet. And when it's time to deploy it, it takes maybe twenty seconds, which is less time than it took to move the table in front of the sofa in the previous less-satisfactory setup.
That wraps up today's effort. Feel free to ask questions or for more information.
I don't expect much more will be happening for a while. This setup worked very well on a recent trip where I spent nine of ten days in the van with different people. There's plenty of comfort, more storage space than needed, and still not much money spent, so it's all going well so far.